Answer:
We see that the big triangle is an equilateral triangle, so all its angles will measure 60°. Therefore x° will be 60° - 30° = 30°, as he's the base angle of an isosceles triangle having the other base angle of 30°. y will simply be 180° - 60° (remembering that the sum of the angles in a triangle is always 180°).
For the first one, 1 1/2 + 1 1/2 = 3
To find this out, take what we know, the 1 1/2 and subtract that from the final answer, 3.
That leaves us with the missing number.
Same with the rest of them, subtract the number that is know from the total.
#3 is 2 1/2
#4 is 1/4
#5 is 1 1/4
Hope this helps!
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