The area of a triangle is 21ft². If the height of the triangle is 7ft, how long is the base of the triangle? Please give your answer and explain how you found it.

Question

asked Mar 25, 2021 213k views

2 Answers

Positivew · Answer 1 · 2021-03-27T02:46:20+0000

Answer:

b = 6ft

Explanation:

Area of a triangle = 1/2 x base x height

Given the area = 21ft^2

Height = 7ft

Base = ?

Using the above formula

21 = 1/2 x b x 7

21 = 7b/2

Cross multiply

7b = 21 x 2

7b = 42

Divide both sides by 7

7b/7 = 42/7

b = 6ft

The length of the base is 6ft

Tjsmith · Answer 2 · 2021-03-28T20:59:05+0000

Answer:

The answer is b = 6

Explanation:

Area of a triangle= 1/2 × b × h

A = 21, h = 7, b = ?

21 = 1/2 × b × 7 (multiplying through)

21 = 7b/2

Cross multiply

2 × 21 = 7b

42 = 7b

b = 42/7

b = 6