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berarti tingginya 15 dan alas nya 8.
rumus nya 15 x 8 dibagi 2.
=120 ÷ 2 = 60 (a)
54 = 1/2.a.9
a = 12
DB = 9²+12²
= √81+144 =√225 =15
BC = 17² - 15²
= √289 - 225 = √64 = 8
⇔L. BCD = 1/2. 8. 15
= 60 cm²
18. <A = 45∞, <B = 70∞, <C = 65∞
<P = 65∞, <Q = 70∞, < R = 45∞
sisi yg sama panjang;
AB=QR, BC=PQ, CA=RP