Question

If the centroid of the triangle formed by (9, a),(6,-4) and (7,8) is (6,8), then the
value a and b are??
plz answer
class 10 maths ques. from support material book​

Answer 1

Answer:

$= >y= y1 + y2 + y3 \div 3 \\ = > so...y = a + ( - 4) + 7 \div 3\\ = > y = a + 3 \div 3 \\ = > we \: know \: i.e \ \: y = 8 \: then \: ... \\ = > 8 = a + 3 \div 3 \\ = > 8 \times 3 = a + 3 \\ = > a + 3 = 24 \\ = >a = 24 - 3 \\ = > {ans}.....a = 21$

Answer 2

your question is wrong , where b is marked in this question

but

you can solve this question by applying the formula

x= x1+x2+x3/2 and y = y1+y2+y3/2

where coordinates of centroid is x and y

and x1 ,y1

x2,y2

x3,y3

are coordinates of vertices