16. Adjoining triangle PQR is a right angled triangle in which x&PQR -90° and & PRQ a is reference angle. Write the ratio of Sina. Ans: impos RA b. Find the length of PR if PQ-4 unit and R I unit. y Ans. If the length of PR is double of the leng PQ, what is the measurement of a ? Find it. Is a 45° when PQ = QR? Calculate it.