An isosceles triangle has congruent sides of 20cm. the base is 10cm. Estimate the height for the triangle to the nearest tenth of a centimeter.

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The construction of copying qpr is started below. the next step is to set the width of the compass to the length of ab. how does this step ensure that a new angle will be congruent to the original angle? by using compass take the measures of angle and draw the same arc according to it.