Correct Answer - Option 1 : 55 cm
Given:
The height of the triangle is 42 cm
The area is 1155 cm2
Formula used:
Area of the triangle = (1/2) × b × h
where, b is base and h is height
Calculations:
Let the base of the triangle be b
According to the question, we have
Area = (1/2) × b × h
⇒ 1155 = (1/2) × b × 42
⇒ 1155 = b × 21
⇒ b = 1155/21
⇒ b = 55 cm
∴ The base of the triangle is 55 cm.