Keliling belah ketupat ABCD adalah 60cm jika panjang AD=18cm. Tentukan luas belah ketupat ABCD ....

Pertanyaan

A. Acfreelance

Master Teacher

Mahasiswa/Alumni UIN Walisongo Semarang

Jawaban terverifikasi

Jawaban

luas belah ketupat ABCD ialah table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell 216 cm squared end cell end table

table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell 216 cm squared end cell end table

Pembahasan

Mencari luas belah ketupat pertama-tam mencari diagonal terlebih dahulu

$table attributes columnalign right center left columnspacing 0px end attributes row cell Keliling space end cell equals cell space 4 cross times straight s end cell row cell 60 cm end cell equals cell 4 cross times straight s end cell row cell fraction numerator 60 cm over denominator 4 end fraction end cell equals straight s row cell 15 cm end cell equals straight s end table$

Setelah itu mencari tinggi terlebih dahulu sebelum mencari diagonal

table attributes columnalign right center left columnspacing 0px end attributes row straight t equals cell square root of 15 squared minus 9 squared end root end cell row blank equals cell square root of 225 minus 81 end root end cell row blank equals cell square root of 144 end cell row blank equals 12 end table

table attributes columnalign right center left columnspacing 0px end attributes row cell straight d subscript 2 end cell equals cell 12 cross times 12 end cell row blank equals 24 end table

setelah mendapatkan diagonal 1 dan 2 maka luas belah ketupat

table attributes columnalign right center left columnspacing 0px end attributes row straight L equals cell 1 half cross times straight d subscript 1 cross times straight d subscript 2 end cell row blank equals cell 1 half cross times 18 cross times 24 end cell row blank equals cell 216 cm squared end cell end table

Jadi luas belah ketupat ABCD ialah table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell 216 cm squared end cell end table

226

0.0 (0 rating)