How many triangles can be drawn having its angles as 450, 640 and 720? Give reason for your answer.
Answer: Zero
Solution.
The three angles given are 450, 640 and 720
Now, the sum of these angles = 450+640+720
= 181o
Sum of angles of a triangle cannot be more than 1800.
Hence, the triangle is not possible
So the answer is zero.