A = 2 1 ∗ b ∗ h b ∗ h = 2 1 A = 1 A ∗ 1 2 b ∗ h = 2 A h = b 2 A
To solve A = 2 1 bh for h , first multiply both sides by 2 to get 2 A = bh , then divide by b yielding h = b 2 A . This gives you the height based on the area and the base of the triangle.
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3/5 + 4/7 = 21/35 + 20/35 = 41/35 = 1 6/35
[tex] \frac{3}{5} + \frac{4}{7} \\ \\ = \frac{21}{35} + \frac{20}{35} \\ \\ = \frac{21 + 20}{ 35} \\ \\ = \frac{41}{35} = 1 \frac{6}{35} [/tex]