Perhatikan gambar berikut !
*
Gambar ada dibawah
A.125cm persegi
B.120 cm persegi
C.115 cm persegi
D.110 cm persegi
*
Gambar ada dibawah
A.125cm persegi
B.120 cm persegi
C.115 cm persegi
D.110 cm persegi
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Jawaban:
B. 120 cm²
Penjelasan dengan langkah-langkah:
« PANJANG AB
AB = √OB² – OA²
= √17² – 8²
= √289 – 64
= √225
= 15 cm
« LUAS OAB
L∆ OABC = 1/2 × a × t
= 1/2 × OA × AB
= 1/2 × 8 × 15
= 4 × 15
= 60 cm²
L OABC = 2 × L∆ OAB
= 2 × 60
= 120 cm² (B)
Jadi, luas OABC adalah 120 cm² (Opsi B)