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AC² = AB² + BC²
= 20² + 40²
= 400 + 800
= 1200
AC = √1200
=√(3 . 4 . 100)
AC = 20√3 cm
1/2AC = 10√3 cm
jrk F ke tengah2 ABCD (T):
FT² = BT² + BF²
= (10√3)² + 20²
= 100 . 3 + 400
= 700
FT = √700
= √7.100
FT = 10√7