# Math in Focus Grade 8 Chapter 7 Answer Key The Pythagorean Theorem

Practice the problems of Math in Focus Grade 8 Workbook Answer Key Chapter 7 The Pythagorean Theorem to score better marks in the exam.

## Math in Focus Grade 8 Course 3 A Chapter 7 Answer Key The Pythagorean Theorem

### Math in Focus Grade 8 Chapter 7 Quick Check Answer Key

Find the square of each number.

Question 1.
3
9,

Explanation:
Given number is 3 the square is 32 = 3 X 3 = 9.

Question 2.
$$\frac{1}{4}$$
$$\frac{1}{16}$$,

Explanation:
Given number is $$\frac{1}{4}$$ the sqaure is
($$\frac{1}{4}$$)2 = $$\frac{1}{4}$$ X $$\frac{1}{4}$$ =
$$\frac{1 X 1}{4 X 4}$$ = $$\frac{1}{16}$$.

Question 3.
-7
49,

Explanation:
Given number is -7 the square is (-7)2 = -7 X -7 = 49.

Find the square roots of each number.

Question 4.
16
4,

Explanation:

Question 5.
64
8,

Explanation:

Question 6.
400
20,

Explanation:

Find the cube of each number.

Question 7.
$$\frac{1}{2}$$
$$\frac{1}{8}$$,

Explanation:
Given $$\frac{1}{2}$$ the cube is ($$\frac{1}{2}$$)3 =
$$\frac{1}{2}$$ X $$\frac{1}{2}$$ X $$\frac{1}{2}$$ =
$$\frac{1 X 1 x 1}{2X 2 X 2}$$ =$$\frac{1}{8}$$.

Question 8.
7
343

Explanation:
Given 7 the cube is (7)3 = 7 X 7 X 7 = 343.

Question 9.
11
1331,

Explanation:
Given 11 the cube is (11)3 = 11 X 11 X 11 = 1331.

Find the cube root of each number.

Question 10.
8
2

Explanation:

Question 11.
27
3

Explanation:

Question 12.
125
5

Explanation:

Use graph paper. Plot each pair of points on a coordinate plane. Connect the points to form a line segment and find its length.

Question 13.
(3, 5) and (3, 9)
The objective is to plot and connect point (-3, 1) and point(-3, -3) on a coordinate plane, then identify the length of the line that the two points create.

Note that to represent point (-3, 1), point out in which part of the graph does -3 and 1 meet. -3 is 3 units to the left of 0 and 1 is 1 unit up. Likewise, for point (-3, -3), point out in which part of the graph does -3 and -3 meet. The first -3 is 3 units to the left of 0 and the other -3 is 3 units down. Then, let O be the point (-3, 1), and P be the point (-3, -3).

To find the length of the line segment $$\overline{O P}$$, get the absolute value of the difference of y-coordinate of point O  to the y-coordinate of P since points O and P have the same x-coordinate which is -3. Then
length of $$\overline{O P}$$ = |1 – (-3)|
= |1 + 3|
= 4
Therefore, the length of $$\overline{O P}$$ is 4 units.

Question 14.
(3, -6) and (3, -9)
The goal of this task is to plot and connect point (1, 2) and point (1, -1) on a coordinate plane, then identify the length of the line that the two points create.

Notice that to show point (1, 2), specify in which part of the graph does 1 and 2 meet. 1 is 1 unit to the right of 0 and 2 is 2 units up. Likewise, for point (1, -1), specify in which part of the graph does 1 and -1 meet 1 is 1 unit to the right of 0 and -1 is 1 unit down. Then, Let Q be the point (1, 2), and R be the point (1, -1).

To find the length of the line segment $$\overline{Q R}$$, get the absolute value of the difference of y-coordinate of point Q  to the y-coordinate of R since points Q and R have the same x-coordinate which is 1. Then
length of $$\overline{Q R}$$ = |2 – (-1)|
= |2 + 1|
= 3
Therefore, the length of $$\overline{Q R}$$ is 3 units.

Question 15.
(-4, 9) and (-8, 9)
The target of this task is to plot and connect point (1, -3) and point (5, -3) on a coordinate plane, then identify the length of the line that the two points create.

Observe that to represent point (1, -3), point out in which part of the graph does 1 and -3 meet 1 is 1 unit to the right of 0 and -3 is 3 units down. Likewise, for point (5, -3), point out in which part of the graph does 5 and -3 meet 5 is 5 units to the right of 0 and -3 is 3 units down Then, let S be the point (1, -3), and T be the point (5, -3).

Now, to find the length of the line segment $$\overline{S T}$$, get the absolute value of the difference of x-coordinate 1 of point S to the x-coordinate of T since points S and T have the same y-coordinate which is -3. Then
length of $$\overline{S T}$$ = |1 – 5|
= |-4|
= 4
Therefore, the length of $$\overline{S T}$$ is 4 units.

Question 16.
(-2, 5) and (8, 5)
The objective of this task is to plot and connect point (-5, 3) and point (5, 3) on a coordinate plane, then identify the
length of the line that the two points create.

Note that to show point (-5, 3), specify in which part of the graph does -5 and 3 meet -5 is 5 units to the left of 0 and 3 is 3 units up. Likewise, for point (5, 3), specify in which part of the graph does 5 and 3 meet 5 is 5 units to the right of 0 and 3 is 3 units up. Then, let U be the point (-5, 3), and V be the point (5, 3).

Next, to determine the length of the Line segment $$\overline{U V}$$, get the absolute value of the difference of x-coordinate of point U to the x-coordinate of V since points U and V have the same y-coordinate 3. Then
length of $$\overline{U V}$$ = |-5 – (5)|
= |-5 + -5|
= |-10|
= 10
Therefore, the length of $$\overline{U V}$$ is 10 units.

Find the volume of each solid. Use 3.14 as an approximation for π. Round your answers to the nearest tenth if necessary.

Question 17.

Volume of cone 1206.37 cm3 ,

Explanation:

Question 18.

The volume of cylinder 1206.37 cm3 ,

Question 19.

Volume of sphere is 33.51 cm3,

Explanation:

Question 20.

Volume of triangular prism is 35 cm3 ,

Explanation:
Volume of triangular prism = area of cross-section X length,
5 cm× 7 cm = 35 cm3.

Question 21.