Beginning of the school year. trigonometry

Step-by-step explanation:

With 30°-60°-90° and 45°-45°-90° triangles, the sides have common ratios. The ratios for 30°-60°-90° triangle sides are:

So 4. for example has a shorter side length of 5 units, which means the longer side is 5√(3) units long, and the hypotenuse is 10 units long.

*For 45°-45°-90° triangles, the ratios are:

i think it is everything has to equal 180 so, if i correct 4=c. 6=d. 8=a. 7=b. and the last question would be c. because they are parallel lines and they are congruent.

step-by-step explanation:

the reason everything has to equal to 180 is because that is how it works. i'm guessing that is its rule. 4 and 8 are congruent and parallel so, that would be 30+30 because they have the same number. it would equal 60. 6 and 7 are congruent and parallel so, that would be 30+30 because they have the same number. it would equal 60. 60+60 is 180. so, now you have your answer

2nd one in the first row is correct