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lihat <PRQ = 36'
mengapa?
karena seletak dengan <Q
maka,karena sudut segitiga seluruhnya berjumlah = 180'
maka <PQR = 180' - 48' - 36'
= 96'
7.
Lihat <QRS = 124'
berpelurus dengan <PRQ = 180' - 124' = 56'
SUDUT SEGITIGA BERJUMLAH = 180'
<P + <Q + <R = 180'
2X-3' + 4X+1' + 56' = 180'
6X - 2' = 124'
6X = 126'
X = 126 : 6
= 21'
<PQR = 4X + 1 = 4.(21) + 1
= 85'
9.
SEPERTI CARA NO.7
MAKA:
2x-3+3x+1+52 = 180'
5x + 50 = 180'
5x = 180' - 50'
x = 30' : 5
x = 6'
<LKM = 2x-3'
= 2.(6) - 3'
= 9'
10
Luas bangun = bangun I + bangun II
bangun I
t = √(20²-12²)
= √(256)
= 16 cm
luas bangun =
=
bangun II
t = √(29²-20²)
= √(441)
= 21 cm
luas bangun =