Perimeter and Area class 7

Choose the two correct formulas for the circumference of the circle.

Ratio of circumference to diameter is a constant and it is denoted as ____.

• 3.41

Find the area of a circle whose radius is 21 cm.

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What is the formula for area of parallelogram?

• A = b x h

What is the area of a right angled triangle having a base 10 cm and height 5 cm?

• 20 sq.cm
• 25 sq.cm
• 30 sq.cm
• 35 sq.cm

What is the perimeter of scalene. Triangle having sides of 40mm, 20mm and 28mm?

• 68 mm
• 78 mm
• 88 mm
• 98 mm

What is the area of an equilateral triangle of side 450 mm?

• 856.82 cm²

• 866.82 cm²

• 876.82 cm²

• 886.82 cm²

What is the area of a circle of diameter 50 cm?

• 1932.5 cm²

• 1942.5 cm²

• 1952.5 cm²

• 1962.5 cm²

What is the area of a (A) semicircle whose diameter is 20 cm (d)?

• 147.1 cm²

• 157.1 cm²

• 167.1 cm²

• 177.1 cm²