Class 9 · Mathematics · Ganita Manjari

6. Measuring Space: Perimeter and Area

Try question 1

The area of a triangle with base 10 cm and height 6 cm is

Tap an answer to check.

Answer and explanation

Answer: B. 30 cm²

½ × base × height = ½ × 10 × 6 = 30 cm².

Open this question →

Try question 2

In Heron's formula, s stands for

Tap an answer to check.

Answer and explanation

Answer: B. the semi-perimeter

Area = √[s(s − a)(s − b)(s − c)], where s = (a + b + c)/2.

Open this question →

Try question 3

The perimeter of a rectangle 8 cm long and 5 cm wide is

Tap an answer to check.

Answer and explanation

Answer: B. 26 cm

2 × (8 + 5) = 26 cm.

Open this question →