Answer:
s = 10
Explanation:
This Triangle is a Right Triangle with two equal sides ( because there are two equal angles )
Pytha. Theorem
A² + B² = C²
since we have two equal sides the A = B = s
then
s² + s² = c²
2s² = c²
2s² = (10sqrt2)²
2s² = 100 x 2
2s² = 200
s² = 200/2 = 100
s = sqrt ( 100 )
s = 10