The angle [tex]\angle mB=21.3^o[/tex] in a Given: ΔABC; a= 10; b = 4, and c = 11.
What is triangle?
A triangle is a closed, 2-dimensional shape with 3 sides, 3 angles, and 3 vertices. A triangle is also a polygon.
Use the Cosine Rule to find this
[tex]cos \angle B = \dfrac{[b^2 - a^2 - c^2]} { -2ac }[/tex]
[tex]= \dfrac{ [ 4^2 - 10^2 - 11^2] }{ -2\times 10\times 11}[/tex]
= 0.93182
so m < B = 21.3 degrees to nearest tenth
Hence the angle [tex]\angle mB=21.3^o[/tex] in a Given: ΔABC; a= 10; b = 4, and c = 11.
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