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kll 3/4 lingkaran (yg diarsir)
= 3/4 x 22/7 x 14
= 33 cm
kll persegi yang di arsir yaitu 1/4 x 4 x sisi
=1/4 x 4 x 14
=14 cm
33cm + 14cm = 47 cm (d)
no.3
pertama, kita cari tinggi, dengan rumus phytagoras.
t² = SM²-S²
= 13² - (15-10)²
= 13² - 5²
= 169 - 25
= √144
t = 12cm
jadi, kelilingnya ialah 15 + 13 + 10 + 12
= 50 cm