Find the number in place of ?
Solution:
From the 1st
picture (9)2-(4)2= 81-16 = 65
From the 2nd
picture (8)2-(6)2= 64-36 = 28
From the 3rd
picture (7)2-(2)2= 49-4 = 45
Therefore the required number is
45
How many triangles can be formed
from the given picture ?
Solution:
From the picture, the
following triangles can be formed.
AIC, AIB, ADC, AIH, ACH,
ADG,BIC, CID,CHD, DIJ, DIH, JIH, DAH, ADG, HCE, HKD, HKJ, HED, HKG, HEG, JKD,
DKE, DGE, EKF, EKG, EHG, FKG, GDH.
Therefore 28 triangles can be formed from the
given picture.
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