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which of the following sets of numbers could be the lengths of the sides of a triangle?
a. 3.5 cm, 7 cm, 10.5 cm
b. 3.5 cm, 7 cm, 14 cm
c. 3.5 cm, 3.5 cm, 3.5 cm
d. 3.5 cm, 5 cm, 10 cm

the figures below are made out of circles, semicircles, quarter … find the area and the perimeter of each figure and give your answers as a completely simplified exact value in terms of π (no approximations). remember that we'll also have to cut whatever areas we get in half, since we're only dealing im pretty sure that is the right answer

step-by-step explanation:

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take good notes.

do your homework.

use mnemonics and other tricks.

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note: the best i know.

here is your mark brainliest

second option

step-by-step explanation:

the measures of a triangle equal 180. use that to find x.

2x+3x+4x=180

9x=180

9x/9=180/9

x=20

now you know x, you know angle a is 40°, angle b is 60°, angle c is 80°.

because angle a is 40°, the first option doesn't work.

because angle b is 60°, the second option does work.

when you add angle a and b, you get 100°. complementary means it equals 90°, so the third option doesn't work.

when you add angle a and c, you get 120°, which is not 100.