plzz tell que-13 & 14
Answers
✨Answer:
Ans 13 = 392 cm^2
Ans 14 = 314 cm^2
✨Step-by-step explanation:
13)
Area of two circles = 2 pi r^2
308 = 2 ☓ pi r^2
Pi ☓ r^2 = 154
r^2 = 154/pi
r^2 = 154/22 ☓ 7
r^2 = 7 ☓ 7
r = 7 cm
Breadth of rectangle = diameter of circle
Breadth of rectangle = 2 ☓ 7 = 14 cm
Length of rectangle = 2 ☓ diameter
Length of circle = 2 ☓ 14 = 28 cm
➡️ Area of rectangle = length ☓ Breadth
➡️ Area of rectangle = 14 ☓ 28 cm^2
➡️Area of rectangle = 392 cm^2
14)
Diameter of circle = 28 cm
Radius = 14 cm
Area of circle = pi ☓ r^2 = 3.14 ☓ 14^2 = 615.44 cm^2
✔️Diameter of circle = 2( diameter of semi circle) + 8 cm
28 = 2 (d) + 8
20 = 2d
✔️d = 10 cm
Diameter of semi circle = 10 cm
➡️Radius = 5cm
➡️Area of shaded region =area of circle - area of semi circles
➡️ Area of shaded region = 615.44- (2☓ pi/2 ☓ r^2)
➡️Area of shaded region =615.44 - pi r^2
➡️Area of shaded portion =615.44 - 3.14☓5^2
➡️Area of shaded portion = 615.44 - 78.5
✔️ Area of shaded portion =536.94 cm^2