Answer: It is a proportional relationship because a proportional relationship is known as a relationship between two quantities, in which the ratio of one quantity to the other quantity is constant.
Step-by-step explanation:
Sin (A + B) = sin A cos B + cos A Sin B
<span>Cos (A - B) = cos A cos B + sin A sin B </span>
<span>=> (SinACosB+ CosASinB) (CosACosB +SinASinB) </span>
<span>=>SinACosACos^2B+Sin^2ACosBSinB+Cos^2A... </span>
<span>=>SinACosA(Cos^2B+Sin^2B) +SinBCosB(Sin^2A+Cos^2A) </span>
<span>we know that Sin^2+Cos^2=1 </span>
<span>=>SinACosA(1)+SinBCosB(1) </span>
<span>=SinACosA+SinBCosB </span>
<span>Proved
</span>
The base angles of isosceles triangles are congruent therefore Angle c also measures 4x+6. add all 3 angles of any triangle you always get 180
3x+47 + 4x+6 + 4x+6=180
11x=121
x=11 the three angles measure 80, 50, and 50
Diameter = 4 inches
Radius = diameter/2 = 4/2 = 2 inches
Area = πr^2 = π(2)^2 = 4π = 12.57 inches squared approx.
