CBSE Class 10 Maths Triangles

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Answer of the question given below
 Two angles of a triangle are 70° and 80° The vertices of the triangle are on a circle of radius 3.5cm construct the triangle.

question

Using Basic Proportionality Theorem, prove that a line drawn through the midpoint of one side of a triangle parallel to another side bisects the third side. [NCERT]
 what is Thales therom
 in the figure, if de parallel bc and ad = 4x 3 ae = 8x 7 , bd = 3x 1 and ce = 5x 2fi x.d
 In the figure of ∆ABC ,DC AB. If AD = 2x ,DC = X +3, BC = 2x1 and CE =X, then find the value of X.
 In three line segments OA, OB and OC,points L,M,Nrespectively are so shosen that LM ll AB and MN ll BC but neither of L, M nor of A,B,C are collinear. Show that LN ll AC.
 E and F are points on the sides PQ and PR respectively of a _{}PQR. State whether EF  QR. PE = 3.9cm, EQ = 3cm, PF =3.6cm and FR = 2.4cm.