3 years ago

PLZ HELP!! I REWARD BRAINLIEST. plz no silly answers i grinded for these points

Mathematics

1 answer:

Tasya [4]3 years ago

5 0

Answer:

180° - 1/2(α + β)

Step-by-step explanation:

The two angles of the triangle ADB are:

m∠A/2 and m∠B/2 or
α/2 and β/2

The three interior angles add to 180°, so the missing angle is:

m∠ADB = 180° - 1/2(α + β)

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What is the area of the composite figure

oksano4ka [1.4K]

Answer:

Step-by-step explanation:

To find the area of a composite figure, separate it into the regular parts which make the irregular shape. This shape is composed of a semi-circle and a rectangle. Find the area by finding the area of each shape.

Semi-circle:

The semi-circle has a diameter of 2 + 4 + 2 = 8. The area this figure uses the radius which is half the diameter. The radius is 4. To find the area substitute r = 4 into $\pi r^2 = \pi 4^2 = 16\pi$ . However the semi-circle has a smaller circle cut out of it with radius 2. The area of the smaller circle is $\pir^2 = \pi 2^2=4\pi$ . The semi circle in the shape is the areas subtracted which equals 12π.