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TC
sisi miring = 13 cm
sisi depan = 12 cm
sisi samping = 5 cm
13^2= x^2 - 5^2
x^2= 144
x=12 cm
cos = samping / miring
= 5/ 13
maaf klo salah
= 13²+13²-5² / 2.13.13
= 313/338
2. pers parabola
y = a(x-x1)(x-x2)
= a(x-3)(x+3)
= a(x²-9)
3 = a (0²-9)
3 = a (-9)
a = - 1/3
y = - 1/3 (x²-9)
= - 1/3 x² + 3
pers garis =
y - b = m (x-a)
titik (-3,0) Dan (2, c),
utk c didpt Dr y= -1/3 2² + 3
y= 5/3
shg titik (-3,0) Dan (2, 5/3)
m= 5/3-0 / 2+3
= 5/3 / 5
= 1/3
y - 0 = 1/3 (x+3)
y = 1/3 x + 1
rumus luas = integral y2 - y1 (batas 2 Dan -3)
= integral -1/3 x² + 3 - 1/3 x -1
= int - 1/3 x² - 1/3 x + 2 dgn
batas 2 Dan -3