Circles OCR Stage 6.

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Presentation transcript:

Circles OCR Stage 6

Circumference radius is diameter ÷ 2 radius diameter Tangent

Circumference of Circle Formula Circumference, C = d is the diameter d on Calculator? SHIFT EXP =

3 C = X 3 = 9.4247….. = 9.42cm C = X 7 = 21.9911….. 7 = 22.0cm Diameter = 2 x radius = 8 4 C = x 8 = 25.1327… = 25.1cm

If you know the circumference? You can calculate the Radius! 38cm π X d = 38cm d = 38 ÷ π = 12.0957.. = 12.1cm 14cm π X d = 14cm d = 14 ÷ π = 4.4563... = 4.5cm π X d 23cm = 23cm d = 23 ÷ π = 7.3211... r = d ÷ 2 = 7.3211..÷ 2 = 3.660.. r = 3.7cm

Area of Circle

Area of Circle Formula Area, A = r on Calculator? SHIFT EXP =

3 A = X 32 = 28.274….. = 28.3cm2 A = X 72 = 153.938….. 7 = 153.9cm2 Radius = diameter / 2 = 8 16 A = x 82 = 201.061… = 201.1cm2