Measure the three sides using a ruler. Then use the Cosine Rule.
If the sides are a, b and c cms, then to calculate angle C, the cosine rule is
c2 = a2 + b2 - 2abCos(C)
So, calculate [a2 + b2 - c2]/2ab
and then calculate cos-1 of the result.
the obtuse angle is the largest angle in a triangle. It spreads from 91 to 179 on a protractor
You don't always need a protractor to make an angle, just use a normal ruler.
Use a protractor.
It has one right angle (90 degrees). If you don't have a protractor handy, just use the corner of any piece of paper
A protractor is a shape: semi-circle or full circle, that has degrees marked around the edge. Place the marked centre of the protractor on (for example) the corner of two lines forming a right-angle. The bottom line will be zero, while the vertical line will cross the 90 degrees mark of the protractor, so proving that a right-angle is 90 degrees.
Get a...PROTRACTOR!
magic
Use a protractor.
With a protractor
by using a protractor
To measure an angle on a wall accurately, use a protractor. Place the protractor on the corner of the angle and align the baseline with one side of the angle. Read the measurement where the other side of the angle intersects the protractor. This will give you the accurate measurement of the angle.
It is easy to draw an equilateral triangle without a protractor. That gives a 60 degree angle. It is then simply a matter of bisecting the 60 degree angle, using an unmarked rule and compass, to get a 30 degree angle.
the obtuse angle is the largest angle in a triangle. It spreads from 91 to 179 on a protractor
use a protractor
Measure it with a protractor.
To measure an angle accurately, use a protractor. Place the center of the protractor at the vertex of the angle. Align one side of the angle with the 0-degree mark on the protractor. Read the measurement where the other side of the angle intersects the protractor.
Use a protractor.