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##### 3. Fill in the blanks to make the sentences true sentences:(vi) The sum of the measures of acute angle of a right triangle is

4. Find the value of unknowns for the given congruent triangles.

2. From a point on the line bisector of an angle perpendiculars are drawn to the arms of the angle. Prove that these perpendiculars are equal in measure.

1. \mathrm{ABC} is an isosceles triangle. \mathrm{D} is the mid-point of base \overline{\mathrm{BC}} . Prove that \overline{\mathrm{AD}} bisects \angle \mathrm{A} and \overrightarrow{\mathrm{AD}} \perp \overrightarrow{\mathrm{BC}} .

2. Prove that a point which is equidistant from the end points of a line segment is on the right bisector of the line segment.

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3. Fill in the blanks to make the sentences true sentences:(vi) The sum of the measures of acute angle of a right triangle is

(iv) How many acute angles are there in an acute angled triangle?(a) 1(b) 2(c) 3(d) not more than 2 .