Answer:
not sure if i am 100 percent correct have not done this for a while but i think it would be b
Step-by-step explanation:
<h3>
Answer: Choice A</h3>
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Work Shown:
Use that r value and to find the first term
You could use in place of (just make sure to use n = 6 instead of n = 4).
Answer:
28 cm
Step-by-step explanation:
Triangle ABC is obtained by joining the mid points of the sides of triangle XYZ.
So, perimeter of triangle ABC will be equal to half of the perimeter of triangle XYZ.
Answer:
180°
Step-by-step explanation:
A "3-gon" is a triangle. The sum of the measures of its interior angles is 180°.
_____
You can make use of the formula for the sum of interior angles for an n-gon:
angle sum = 180°·(n -2) = 180°·(3 -2) = 180°
or, you can translate the exterior angles so they all have the same vertex and realize they sum to 360°. Then if the interior angles are A, B, C, you have ...
(180 -A) +(180 -B) +(180 -C) = 360
3·180 -(A +B +C) = 2·180 . . . . . collect terms
180 = A + B + C . . . . . . . . . . . . subtract 2·180 and rearrange