Penjelasan:
4.AC²=AT²+CT²-2.AT.CT cos T
(a√2)²=a²+a²-2.a.a cos T
2a²=2a²-2a² cos T
2a²=2a²(1-cos T)
1-cos T=2a²/2a²
=1
cos T =0
T=90°
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Penjelasan:
4.AC²=AT²+CT²-2.AT.CT cos T
(a√2)²=a²+a²-2.a.a cos T
2a²=2a²-2a² cos T
2a²=2a²(1-cos T)
1-cos T=2a²/2a²
=1
cos T =0
T=90°