Answer:
64
Step-by-step explanation:
Youd do 8x8 because the base of the triangles are 8 and a square has equal sides all around
Answer:
x=6/cos(72) is the exact answer.
.
Step-by-step explanation:
Sine
opposite
hypotenuse
Cosine
adjacent
hypotenuse
Tangent
opposite
adjacent
Soh Cah Toa is an abbreviation used to help remember the trigonometric ratios.
We see we have the angle measurement 72 degrees given at the bottom. I'm going to label my sides with respect to that angle.
The hypotenuse is x.
The adjacent is 6.
We don't have anything about the opposite side but we don't need it to find x.
So anyways we have this:
The hypotenuse is x and
the adjacent is 6.
If you look at the ratios we want to use cosine.

or

We are going to cross multiply.
x cos(72)=1 (6)
cos(72) * x=6
Now we are going to divide both sides by cos(72) giving us:
x=6/cos(72)
x=6/cos(72) is the exact answer.
Let's put it into our calculator now:
.
Answer:
25.75 % interest rate
Step-by-step explanation:
Given:
Amount was invested = r% per quarter
Amount invested = P
Rate of interest = r % per quarter
Time (n) = 4 Quarters
Computation:
A = P(1 + r/100)ⁿ
According to question.
⇒ A = P + 1.5P = 2.5P
⇒ 2.5P = P(1 + r/100)⁴
⇒ 2.5 = (1 + r/100)⁴
⇒ 1 + r/100 = 1.2575
⇒ r/100 = 0.2575
⇒ r = 25.75
25.75 % interest rate
Divide to undo the multiplication of n times 72. Move the decimal point two places to the right to write the decimal as a percent. You can estimate to see if the answer is reasonable. Use 10% and 20%, numbers close to 12.5%, to see if they get you close to the answer.
Hope this helps