Question

quiz 8.8.3: area of a triangle
question 1
the area of the rectangle below is ______ sq. units.
5
16
a. 80
b. 21
c. 40
d. 42

question 2
what is the area of the rectangle below?
10
13
a. 65 sq. units
b. 46 sq. units
c. 130 sq. units
d. 23 sq. units

question 3
the area of the triangle below is ______ sq. units.
4
17
a. 42
b. 34
c. 21
d. 68

Explanation:

Question 1

Step1: Recall rectangle area formula

Area = $\text{length} \times \text{width}$

Step2: Substitute given values

Area = $16 \times 5 = 80$

Question 2

Step1: Recall rectangle area formula

Area = $\text{length} \times \text{width}$

Step2: Substitute given values

Area = $13 \times 10 = 130$

Question 3

Step1: Recall right triangle area formula

Area = $\frac{1}{2} \times \text{base} \times \text{height}$

Step2: Substitute given values

Area = $\frac{1}{2} \times 17 \times 4 = 34$

Answer:

1. A. 80
2. C. 130 sq. units
3. B. 34