Jawaban:

_Gambar 1_

Luas persegi panjang

= p × l

= 15 × 12

= 180 satuan luas

Luas persegi

= s × s

= 5 × 5

= 25 satuan luas

Luas daerah berwarna biru

= 180 - 25

= 155 satuan luas ✔️

_Gambar 2_

Cari alas ∆, gunakan phytagoras

= √(5² - 4²)

= √(25 - 16)

= √9

= 3 satuan

Cari atas trapesium (b)

b = 3 + 3

b = 6 satuan

Luas trapesium

= (a + b) × t / 2

= [12 + 6] × 4 / 2

= 18 × 2

= 36 satuan luas

Luas segitiga

= (a × t) / 2

= (6 × 4) / 2

= 6 × 2

= 12 satuan luas

Luas daerah berwarna biru

= 36 - 12

= 24 satuan luas ✔️

_Gambar 3_

diagonal 1

= 12 + 12

= 24 satuan

diagonal 2, cari dgn phytagoras

= √(15² - 12²) + √(13² - 12²)

= √(225 - 144) + √(169 - 144)

= √81 + √25

= 9 + 5

= 14 satuan

Luas layang-layang

= (d1 × d2) / 2

= (24 × 14) / 2

= 24 × 7

= 168 satuan luas ✔️

_Gambar 4_

cari tinggi jajar genjang, gunakan phytagoras

= √(5² - 3²)

= √(25 - 9)

= √16

= 4 satuan

Luas jajar genjang

= a × t

= 7 × 4

= 28 satuan luas ✔️

_Gambar 5_

Cari diangonal 2, gunakan phytagoras

= 2 × √(20² - 16²)

= 2 × √(400 - 256)

= 2 × √144

= 2 × 12

= 24 satuan

Luas belah ketupat

= (d1 × d2) / 2

= (32 × 24) / 2

= 32 × 12

= 384 satuan luas ✔️

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Semangattt ya'