21.
BC² = AC² + AB²
= (3√5)² + 2²
= 45 + 4
= 49
BC = 7cm
22.
tinggi = RP²
luas = a * t : 2
54 = 9 * t : 2
108 = 9t
t = 108:9
= 12cm
QR² = RP² + PQ²
= 12² + 9²
= 144 + 81
= 225
QR = 15cm
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21.
BC² = AC² + AB²
= (3√5)² + 2²
= 45 + 4
= 49
BC = 7cm
22.
tinggi = RP²
luas = a * t : 2
54 = 9 * t : 2
108 = 9t
t = 108:9
= 12cm
QR² = RP² + PQ²
= 12² + 9²
= 144 + 81
= 225
QR = 15cm