Answer:
see explanation
Step-by-step explanation:
a and b lie on the straight line CA, hence
and b sum to 180°, that is supplementary angles
12 students
Step-by-step explanation:
40 % ×30 students = 1200 ÷ 100% =12students
Answer:
1
Step-by-step explanation:
use the method
keep
change
flip
keep the first number
change the symbol from division to multiplication
flip second fraction
<u>Given</u>:
The triangle DEF is a right triangle.
The length of EF is 12 units.
The length of DE is y units.
The measure of angle D is 25°
We need to determine the value of y.
<u>Value of the variable:</u>
The value of the variable y can be determined using the trigonometric ratio.
Thus, we have;

Substituting
, EF = 12 and DE = y, we get;

Simplifying, we get;



Rounding off to the nearest tenth, we get;

Thus, the length of the variable y is 20.8 units.