With reference to the diagram, what is cos a?

cos(A)=sin(26.57°)=0.447

Step-by-step explanation:

we know that

In the right triangle ABC

The angle A and the angle C are complementary angles

so

∠A+∠C=90°

therefore

cos(A)=sin(C) -------> by complementary angles

we have

C=26.57°      

sin(26.57°)= 0.447

Hence

cos(A)=sin(26.57°)=0.447

Alternative Method

In the right triangle BDC

Find BD applying Pythagoras Theorem

substitute the values

substitute the values

pay attention in your classes and concentrate the best thing you can do to raise your test scores is to pay attention when you're supposed to be learning the material: in class!

take good notes.

do your homework.

use mnemonics and other tricks.

do practice tests.

note: the best i know.

answer: b)

step-by-step explanation:

its a dot plot because since the score is not high numbers.

- r3ktforgood ☕