" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2024 KUDO.TIPS - All rights reserved.
nah, cari dulu sudut QOR nya.
QOR = 180 derajat - 72 derajat = 108 derajat.
panjang busur QR :
72 = 108
35 = x
x = 108 x 35 dibagi 72 = 52,5 cm
b. K lingkaran = phi x diameter
108 QR
QR = 108.35
72
QR = 52,5
K= bPQ + b QR + bPR
= 35 + 52,5 + (35+52,5)
= 35 + 52,5 + 87,5
= 175