The elevation at Mt. Patrick is 2285 ft. The elevation at Ivy Valley is -365 ft. How much higher is Mt. Patrick than Ivy Valley?

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.