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for a triangle list the respective names of the points of concurrency of
-perpendicular bisectors of the sides
-bisectors of the angles
-medians
-lines containing the altitudes

1. Point of concurrency of perpendicular bisectors of sides is called as the Circumcentre (S)

2. Point of concurrency of bisector of angles is called as the Incentre (I)

3. Point of concurrency of all three medians is called as the Centroid (G) .

4. Point of concurrency of altitudes of corresponding vertices is called as the Orthocentre (O).

12

step-by-step explanation:

12 + 5 = 17

12x2=24

24-7=17