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180°
Step-by-step explanation:
Sum of ext. angles of the central pentagon, when sides r extended ckockwise, is 360°. And, when extended anti clockwise, is also 360°. So, the sum of base angles of the 5 triangles, is 360°+360°= 720°. Total sum of angles of 5 triangles, is 180°×5= 900°. So, ANG. P+ANG.Q +ANG.R+ ANG. S+ ANG. T= 900°-720°= 180°...
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