Soal digambar Ngasal => report

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Soal digambar Ngasal => report

Jawaban:

Bangun Datar

Penjelasan dengan langkah-langkah:

1. Keliling persegi panjang = 60 cm

2 ( p + l ) = 60

( p + l ) = 60/2

( p + l ) = 30 cm

p = 30 – l

Luas = P x L

(30-l)xl = 0

30l-l²=0

-l²+30l=0

-2l+30=0

-2l=-30

l=-30/-2

l=15 cm

P=30-l

=30-15

=15 cm

P = 15 cm dan L = 15 cm

Luas maksimum = 15 cm x 15 cm = 225 cm²

2. S₁+S₂=50 cm

S₁=50-S₂

Luas segitiga

1/2 x a x t

1/2 x S₁ x S₂

1/2 x (50-S₂) x S₂

1/2 x (50S₂ – S₂²)

25S₂-1/2S₂²

-1/2S₂²+25S₂=0

2(-1/2)S₂+25=0

-1S₂+25=0

-S₂+25=0

-S₂=-25

S₂=-25/-1

S₂=25 cm

S₁=50-S₂

=50-25

=25 cm

S₁=25 cm dan S₂=25 cm

Luas maksimum = 1/2 x 25 x 25 = 1/2 x 625 = 312,5 cm²

Demikian

Semoga membantu dan bermanfaat!