State 'T' for true and 'F' for false.
(1) In a triangle, the measure of exterior angle is equal to the sum of the measure of interior opposite angles.
(2) The sum of the measures of the three angles of a triangle is $90^{o}$ .
(3) A perpendicular is always at 90 to a given line or surface.
(1) (2) (3)

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Solution

The correct option is B T F T
(1) True : It is the exterior angle property of the triangle.

(2) False : The angle sum property states that the sum of all three angles of a triangle is 180 degrees.

(3) True : On any given line/surface, A perpendicular is always at 90 degree to it.

Hence, the correct option is C-TFT.

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State 'T' for true and 'F' for false.(1) In a triangle, the measure of exterior angle is equal to the sum of the measure of interior opposite angles.(2) The sum of the measures of the three angles of a triangle is 90o.(3) A perpendicular is always at 90 to a given line or surface.(1) (2) (3)