Question

circle worksheet diameter & radius 1 a. r = 7.5 yd calculate the diameter of the circle. 1 b. d = 3.8 cm calculate the radius of the circle 2 a. r = 7.4 ft calculate the diameter of the circle. 2 b. d = 4.4 in calculate the radius of the circle 3 a. d = 4.5 ft calculate the radius of the circle. 3 b. d = 2.9 mm calculate the radius of the circle

Explanation:

Step1: Solve 1a (radius to diameter)

Formula: $d = 2r$. $r=7.5$ yd → $d=2×7.5=15$ yd

Step2: Solve 1b (diameter to radius)

Formula: $r = \frac{d}{2}$. $d=3.8$ cm → $r=3.8÷2=1.9$ cm

Step3: Solve 2a (radius to diameter)

Formula: $d=2r$. $r=7.4$ ft → $d=2×7.4=14.8$ ft

Step4: Solve 2b (diameter to radius)

Formula: $r=\frac{d}{2}$. $d=4.4$ in → $r=4.4÷2=2.2$ in

Step5: Solve 3a (diameter to radius)

Formula: $r=\frac{d}{2}$. $d=4.5$ ft → $r=4.5÷2=2.25$ ft

Step6: Solve 3b (diameter to radius)

Formula: $r=\frac{d}{2}$. $d=2.9$ mm → $r=2.9÷2=1.45$ mm

Answer:

1a: 15 yd
1b: 1.9 cm
2a: 14.8 ft
2b: 2.2 in
3a: 2.25 ft
3b: 1.45 mm