Apply the commutative property to 13 × 7 × 21 to rearrange the terms and still get the same solution.
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4. You're right that the leg labeled 
occurs in a 1-to-2 ratio with the hypotenuse, but more to the point, it also occurs with the leg of length 10 in a 1-to-
ratio. In other words,
and so
5. In this kind of triangle, the legs form a 1-to-
ratio with the hypotenuse, so it follows that 
.
6. You have and 
mismatched. The larger leg in this kind of triangle has the scaling factor. So in fact, 
, which makes the larger leg 
, and the hypotenuse would be 
.
and so
5. In this kind of triangle, the legs form a 1-to-
6. You have