Question

. Find the circumference of the given circle
and the area of the shaded region when area
of triangle ABC is 50 cm. (Take t = 3.14)
C
10 cm
А
B
1​

Answer 1

Answer:

28.5 cm²

Step-by-step explanation:

• To find the circumference of the circle we have to use a formula pie×D

d=10cm

=3.14×10

circumference=31.4cm

• To find area of the circle we have to use the formula pie×r² square

=3.14x(10/2)²

=3.14×5²

=78.5 cm²

• To find the area of the shaded regionwe have to minus the area of triangle from the whole area

=78.5 cm²- 50cm²

area of the shaded region = 28.5cm²

Answer 2

Answer:

• area of shaded potion=28.5cm2
• circumference of circle 31.4

find the the area for the whole circle first to identify the area for the shaded potion

• so use the formula pi r square
• so the area for the whole circle is 78.5
• now subract the area of the triangle (50cm2) from the area of the whole circle (78.5cm2)
• so the area for the shaded potion is 28.5cm2

To find the circumference of the circle use the formula 2pi r take pi=3.14, R=5

• so the circumference of the circle=31.42