Two sides of a triangle are 5cm and 9cm long.The ratio of the opposite angles is 1:3.
Two sides of a triangle are 5cm and 9cm long.The ratio of the opposite angles is 1:3.
Determine the angles and the length of the third side of the triangle!
Determine the angles and the length of the third side of the triangle!
數(shù)學(xué)人氣:468 ℃時(shí)間:2020-02-12 16:10:33
優(yōu)質(zhì)解答
三角形的兩邊是5厘米和9厘米長(zhǎng).該兩邊相對(duì)角度比例為1 : 3.確定第三個(gè)三角形的一邊所對(duì)的角度和長(zhǎng)度!設(shè)第三變?yōu)閤,三個(gè)角為α,3α,π-4α 由三角面積公式1/2*5x*sin3α=1/2*5*9sin4α=1/2*9*x*sinα5sin3α=9si...
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