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100=4s
s=100/4
s=25
x=√25²-24²
=√625-576
=√49
x=7cm
AC=48cm
BD=2×7=14cm
L=d1×d2
-------------
2
=48×14
---------
2
=336 cm²
d1 = 48
Keliling = 4 x sisi (karena sisi belahketupat sama panjang)
Panjang sisi = 100/4 = 25cm
Supaya sisi dan d1 membentuk segitiga siku-siku, d1 & d2nya dibagi 2
1/2 d1 = 48/2 = 24
1/2 d2 = √ s² - (1/2 d1)² (rumus pythagoras)
1/2 d2 = √25² - 24² = √625 - 576 = √49 = 7cm
d2 = 7 cm × 2 = 14cm
Luas = d1 x d2 / 2 = 48 x 14 /2
= 672/2 = 336cm²
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