Check the picture below.
Make sure your calculator is in Degree mode.
Answer:
B
Step-by-step explanation:
In the future use desmos graphing calculator and try them all to see if they work.
<h3>Answer:</h3>
7
<h3>Explanation:</h3>
The formula usually used for the sum of interior angles of an n-sided convex polygon is ...
... angle sum = 180°×(n -2)
In your case, angle sum is 900°, so this becomes
... 900 = 180(n -2)
... 5 = n -2 . . . . . . . . . divide by 180
... 7 = n . . . . . . . . . . . the polygon has 7 sides
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It may be easy to remember that the sum of exterior angles is always 360°, and each exterior angle adds to its corresponding interior angle to make 180°. Then, for n angles The sum of interior and exterior angles is n·180°. Subtracting the sum of exterior angles from this gives the sum of interior angles: n·180° -360° = 180°(n-2).
In a right triangle, the measure of one acute angle is 30 less than twice the measure of the other acute angle. Find the measure of each angle.
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The sum of the 2 acute angles is 90 degrees.
x + y = 90
x = 2y-30
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Substitute for "x" and solve for "y":
2y-30 +y = 90
3y = 120
y = 40
x = 90-y
x = 90-40
x = 50
