To find the area of a regular octagon, you can split the shape into eight congruent triangles from the center, find the area of one triangle, and then multiply it by eight.
If you use this method, you will find that the base of the triangle is the side length of the octagon (in this case, 15 units), and that the height is the apothem (in this case, 18.1 units).
From here, you can use the basic formula used to find the area of a triangle:
A = 1/2bh
A = 1/2 (15) (18.1)
A = 135.75 square units
Finally multiply the area of that triangle by eight.
8(135.75) = 1086
The area of the octagon is 1086 square units.
1. You got it right.
4π/9 x 180/π = 80°
2. To get a coterminal angle you start with your angle and then you add or subtract 360° (one cycle around the circle).
-123+360+360 = 597°
-123-360 = -483°
3. The angle is 215° from the point (1,0) on the unit circle. The angle 215° is between 180° and 270° so it is in quadrant 3.
Answer:
The right option should be c
Step-by-step explanation:
The measure of (OH-)
Answer:
5/6
Step-by-step explanation:
1/3 x 1/5 = 8/15 then add to 3/10 and you get 5/6 simplifed
