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= setengah x 10 x 10 = 50
ada 2 buah segitiga dg besar yg sama. jd, 2 x 50 = 100
Luas Arsir
=2 L∆
=2. ½at
=at
=10×10
=100 cm²
Jawaban C
9)
R=(20+8)/2=14 cm
r1=20/2=10 cm
r2=8/2=4 cm
Luas Arsir
=L ½O besar - L½Okecil1 - L½Okecil2
=½πR² - ½πr1² - ½πr2²
=½π (R²-r1²-r2²)
=½π (14²-10²-4²)
=½π (196-100-16)
=½×3,14 (80)
=3,14 × 40
=125,6 cm²