Find the area of the circular shaped photo frame whose radius 28 cm. I

1.	Find the area of the circular shaped photo frame whose radius 28 cm. If the cost of decoration is ₹ 3 per sq. cm., find total cost of decoration.
Answer» Radius of the circle = 28 cm Area = πr² = \(\frac {22}7\) × 28 × 28 = 2464 cm² Circumference of the photo frame 2πr = 2 x \(\frac {22}7\) × × 28 = 176 cm ∴ Cost of decorative piece at the rate of ₹ 3 per cm is 176 × 3 = ₹ 528

Find the area of the circular shaped photo frame whose radius 28 cm. If the cost of decoration is ₹ 3 per sq. cm., find total cost of decoration.

Answer»

Radius of the circle = 28 cm

Area = πr²

= \(\frac {22}7\) × 28 × 28 = 2464 cm²

Circumference of the photo frame 2πr

= 2 x \(\frac {22}7\) × × 28 = 176 cm

∴ Cost of decorative piece at the rate of ₹ 3 per cm is 176 × 3 = ₹ 528