3. Special Right Triangles
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Notice that the given figure is a 45^(∘)-45^(∘)-90^(∘) triangle.
7sqrt(2)
Notice that the given right triangle has a marked angle measuring 45^(∘). Therefore, by the Triangle Angle Sum Theorem, the measure of the third angle must also be 45^(∘).
.LHS /sqrt(2).=.RHS /sqrt(2).
a/b=a * sqrt(2)/b * sqrt(2)
sqrt(a)* sqrt(a)= a
a/b=.a /2./.b /2.
a/1=a
Rearrange equation