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3a] OP = OR = 8 cm

QR = √(OQ² - OR²)

QR = √(17² - 8²)

QR = √(289 - 64)

QR = √225

QR = 15 cm

b] Luas

= 2 . 1/2 . OR . QR

= 8 . 15

= 120 cm²

c] Luas layang-layang = 120

1/2 . OQ . PR = 120

1/2 . 17 . PR = 120

PR = 120 . 2/17

PR = 14,12 cm

Kelas 7

Pelajaran Matematika

Bab 8 Segitiga dan Segiempat

Kata kunci : luas

Kode kategorisasi : 7.2.8

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