Panjang busur kecil PQ = 22 cm.

Panjang jari-jari lingkaran adalah..

(π = 22/7)

A. 14 cm
B. 18 cm
C. 24 cm
D. 28 cm

Panjang busur kecil PQ = 22 cm.

$rm to r = 28~cm$

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$rm 2πr = 360°$

$rm 2 times dfrac {22}{7} times r = 360°$

$rm dfrac {44}{7} times dfrac {1}{8} times r = 360° times dfrac {1}{8}$

$rm dfrac {44}{56} times r = 45°$

$rm dfrac {44}{56} times r = 22~cm$

$rm r = dfrac {56 times 22~cm}{44}$

$rm r = 28~cm$