12 times 13 equals what
2 answers:
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Let's start from the left side, and manipulate it to get the right side, which would prove the identity.
We know that:
i)
ii)
.
From the above fundamental identities, we can rewrite the left hand side as:
,
which is what we needed to show.
We know that:
i)
ii)
From the above fundamental identities, we can rewrite the left hand side as:
which is what we needed to show.
Assume that,
The two angles of one triangle are congruent to two angles of a second triangle.
To prove: The third angles of the triangles are congruent.
Since, two angles of one triangle are congruent to two angles of a second triangle.
Therefore,
Adding these two we get,
Cancelling 180 on both sides, we get
Hence, if two angles of one triangle are congruent to two angles of a second triangle, the the third angles of the triangles are congruent.