객관식
Given the polar curves and , what is the area of the region that lies inside both curves?
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7. Non-Right Triangles
Area of SAS & ASA Triangles
객관식
A triangle A B C has sides and with included angle . If a sector of a circle with radius and central angle is drawn such that the triangle is inscribed within the sector and the region outside the triangle but inside the sector is shaded, what is the area of the sector that is not shaded?
A
The area is
B
The area is
C
The area is
D
The area is
검증된 단계별 안내1
Identify the given elements: a triangle ABC with sides \(a\) and \(b\) enclosing an angle \(C\), and a sector of a circle with radius \(r\) and central angle \(C\) that contains the triangle inside it.
Recall the formula for the area of the sector of a circle: \(\text{Area}_{\text{sector}} = \frac{r^{2} C}{2}\), where \(C\) is in radians.
Recall the formula for the area of triangle ABC using two sides and the included angle: \(\text{Area}_{\triangle} = \frac{1}{2} a b \sin(C)\).
Since the triangle is inscribed inside the sector, the shaded region is the part of the sector outside the triangle. The problem asks for the area of the sector that is not shaded, which means the area of the triangle itself.
The correct expression for the area of the sector that is not shaded can be derived by considering the difference between the sector area and the shaded region, leading to the formula \(\frac{(a b - r^{2})}{2} \sin(C)\).
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