Basic Geometry : Plane Geometry
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Example Questions
Example Question #531 : Triangles
Find the measurement of 
Recall that the angles inside of a triangle must add up to 
Thus, for the triangle in question,
Example Question #21 : How To Find An Angle In A Right Triangle
Find the measurement of 
Recall that the angles inside of a triangle must add up to 
Thus, for the triangle in question,
Example Question #23 : How To Find An Angle In A Right Triangle
Find the measurement of 
Recall that the angles inside of a triangle must add up to 
Thus, for the triangle in question,
Example Question #21 : How To Find An Angle In A Right Triangle
A right triangle has equal legs of 
The equation to find the area of a triangle is:
In this problem, both the base and the height are 6in. By plugging in the numbers, we get
Example Question #21 : How To Find An Angle In A Right Triangle
A right triangle has another angle that is 47 degrees. What is the third angle?
The inside of a triangle has three angles that total 180 degrees. If one is 47 and the other is the right angle (90).
Then
To find the missing angle subtract the sum above from 180.
Example Question #26 : How To Find An Angle In A Right Triangle
If one angle of a right triangle measures 
First we need to know that no matter what type of triangle it is, when we add up the measures of all three angles, the total is 
So our final answer is
Example Question #27 : How To Find An Angle In A Right Triangle
Refer to the above figure.
True or false: 
False
True
False
If 
However, since 
It follows that 
Example Question #22 : How To Find An Angle In A Right Triangle
If one angle of a right triangle is 
First we need to know that when we add up all 3 angles of a triangle, the sum will always equal 
We know another angle equals 
Our final answer is 
To check our answer we can add up the three angles to make sure we come up with a sum of 
Example Question #22 : How To Find An Angle In A Right Triangle
True or false:
False
True
True
By the 30-60-90 Triangle Theorem, the ratio of the length of the longer leg of a 30-60-90 triangle to that of the shorter leg is 
the correct ratio. This is indeed a 30-60-90 triangle, and, 
Example Question #543 : Triangles
A right triangle has side lengths of 5, 10, and 11.18 inches. One angle is 63.4 degrees. What is the measure of the other angle?
None of these.
Since this is a right triangle, simply add this right angle to the given angle and subtract from 180 degrees.
The side lengths are not relevant in this problem.
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