Question 1 Perimeter: Perimeter: Perimeter: The quarter, semi and three-quarter circles above all have a radiu

Question

Question 1
Perimeter:
Perimeter:
Perimeter:
The quarter, semi and three-quarter circles above all have a
radius of 10cm. Work out the perimeter of each shape
I NEED AMSWERS ASAP

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Thu Cúc 3 years 2021-08-25T01:44:51+00:00 1 Answers 13 views 0

Answers ( )

    0
    2021-08-25T01:46:28+00:00

    Answer:

    Step-by-step explanation:

    Perimeter of quarter circle = r + r + \frac{1}{4}*2*\pi *r

                = 10 + 10 + \frac{1}{4}*2*3.14*10\\\\= 10 + 10 +  3.14*5\\\\\\= 10 + 10 + 15.70\\\\= 35.70 cm

    2) d = 2*10 = 20 cm

    Perimeter of semicircle = diameter + (1/2) * circumference of circle

                             = 20 +  \frac{1}{2}* 2*\pi *r\\\\= 20 + \frac{1}{2}*2*3.14*10\\\\= 20 + 3.14*10\\\\= 20 + 31.4\\\\= 51.40 cm

    3) Perimeter of three-quarter =  r + r + (3/4)* circumference of circle

              = 10 + 10 + \frac{3}{4}*2*\pi *r\\\\= 10 + 10 + \frac{3}{4} * 2 * 3.14 * 10\\\\= 10 + 10 + 3 * 3.14 * 5\\\\= 10 + 10 + 47.1\\\\= 67.1 cm

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