No it is not , but if you add 4th top at any site => you have quadrangle with one angle equal 180 degrees. Is it correct?
A right triangle in a plane is one in which one of the three angles is a right angle. It is obious that the two sides, making up the right angle, must be perpendicular. In symbols, if triangle ABC is a right triangle with angle B as the right angle, then the sides AB and BC are perpendicular.
Subtract the 3 known angles from 360 to find the 4th angle.
Click the triangle of 1, and the wheel will turn. When you find another triangle at the hole, click the triangle of 2. When you find another triangle at the hole again, click the triangle of 3. When you find the last triangle at the hole, click the triangle of 4. At the hole, you will find the exit button, click on it. However, the 4th triangle is really hard to find!
A quadrilateral has 4 interior angles that add up to 360 degrees and to find the unknown 4th angle while knowing the other 3 angles simply add them up and subtract the sum from 360 to find the 4th angle
When you subtract theta from 180 ( if theta is between 90 degrees and 180 degrees) you will get the reference angle of theta; the results of sine theta and sine of its reference angle will be the same and only the sign will be different depends on which quadrant the angle is located. Ex. 150 degrees' reference angle will be 30 degrees (180-150) sin150=1/2 (2nd quadrant); sin30=1/2 (1st quadrant) 1st quadrant: all trig functions are positive 2nd: sine and csc are positive 3rd: tangent and cot are positive 4th: cosine and secant are positive
Make an equilateral triangle(all same sides) with 3 lines and put the 4th on right through the middle and you have 2 right angle triangles.
a coteminal angle.
A pentagon has 5 sides.A regular pentagon has no right angles (5 interior angles each 108 degrees).An irregular pentagon can have at most 3 right angles, because a 4th would leave 180 degrees to be used for the final angle (540-360), which is a straight line.
180 days after October 4th, 2011 is Sunday April 1st, 2012.
The 4th angle is 110.
4 Triangles A trapezoid makes 3 triangles. The 4th triangle can be placed on the top of the trapezoid.