The area is 0.5*pi*r2 where r is the radius.
The angle is totally irrelevant since it will always by 180 degrees for a semicircle!
The area of the shaded region can be gotten by multiplying the area of the circle by the subtended angle of the sector.
It looks like 3/4 of the area of a circle and it is called a reflex angle
To find the area of the shaded sector, first determine the area of the entire circle using the formula (A = \pi r^2), where (r) is the radius of the circle. Next, find the fraction of the circle represented by the sector by dividing the central angle of the sector (in degrees) by 360 degrees or using the angle in radians divided by (2\pi). Multiply the area of the circle by this fraction to get the area of the shaded sector.
Area of a sector of a circle.
Multiply ( pi R2 ) by [ (angle included in the sector) / 360 ].
Area of sector/Area of circle = Angle of sector/360o Area of sector = (Area of circle*Angle of sector)/360o
6.46
Area of whole circle = pi*r2 = 64*pi Area of Sector = Area of Whole Circle * Angle of Sector/Angle of Whole Circle = Area of Whole Circle * 120/360 = Area of Whole Circle / 3 = 64*pi/3 = 67.0 to the nearest tenth.
If the sector of a circle has a central angle of 50 and an area of 605 cm2, the radius is: 37.24 cm
The area of the shaded region can be gotten by multiplying the area of the circle by the subtended angle of the sector.
6.46
It looks like 3/4 of the area of a circle and it is called a reflex angle
area of sector = (angle at centre*area of circle)/360
This question is too vague to have an answer, but here is one.For the shaded area (pie wedge) of a circle, find the area of the circle and multiply by the ratio of the wedge angle to the entire circle (angle/360).For the shaded region of a triangle, find the area of the smaller triangle, if necessary using trig functions to define a known angle or length of a side.For other polygons, you may be able to divide the area into triangles separately, then sum their areas.
To find the area of the shaded sector, first determine the area of the entire circle using the formula (A = \pi r^2), where (r) is the radius of the circle. Next, find the fraction of the circle represented by the sector by dividing the central angle of the sector (in degrees) by 360 degrees or using the angle in radians divided by (2\pi). Multiply the area of the circle by this fraction to get the area of the shaded sector.
The area of a sector in a circle if the radius is 4 cm and the arc has degree 120 is: 16.76 cm2
Area of a sector of a circle.