ACTIVITY 1: PROVING Triangle Angle Bisector Theorem (TABT) Illustration If: HD bisects 2AHE, DA AH Then: Then: DE EH Notice: that sides on the numerators are adjacent. The same is true with the denominators. Proof Prove DA AH DE EH Proof Extend AH to P such that EP HD. Given HD bisects ZAHE Statements Reasons No. Hints List down the given What happens to the bisected 2. ZAHE? Definition of angle bisector What can you say about 3. HD and EP? By What can you conclude about ZADH & L DEP and 21& L4? Corresponding angles are 4. congruent.

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Ratios

A ratio is a comparison between two numbers of the same kind. It represents how many times one number contains another. It also represents how small or large one number is compared to the other.

Trigonometric Ratios

Trigonometric ratios give values of trigonometric functions. It always deals with triangles that have one angle measuring 90 degrees. These triangles are right-angled. We take the ratio of sides of these triangles.