63 degrees
It is: 63/3 = 21
-63 = -216
63
2/7 of 63 = 63*2/7 = 9*2 = 18
One third of 63 = 21
63 degrees
63
30
It is: 63/3 = 21
21
1/3 of 63 is 21.
63 = 216
The total internal angles of a triangle always equal 180 degrees. Therefore, the third angle of this triangle must be 180 - 54 - 63 = 63. Since this value is the same as one of the stated sides, the triangle is indeed isosceles.
3
81
63