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Soal 25diketahui: d1=9cm + 9cm = 18cm
d2=7cm + 15cm= 22cm
ditanyakan: Luas layang-layang?
jwb: rumus luas layang-layang = 1/2 (d1xd2)
L=1/2 (18cm x 22cm)
L=1/2 (396cm²)
L=198cm²
soal 26
panjang persegi panjang = 24cm
lebar utuh= 16cm
Luas=pxl
L=24cm x 16cm= 384cm²
panjang a= 18cm
t = 8cm
tinggi = 8cm (krn sm dengan lebar persegi panjang)
Luas segitiga= 1/2 (axt)
Luas=1/2 (18cm x 8cm)
Luas=1/2 (144cm)
Luas=72cm²
Luas seluruhnya = 384cm²-72cm² = 312cm²