Reference Book
v) Acute angled triangle: It is that in which all the angles are acute ie. Less
than 90°.
vi) Obtuse angled Triangle: It is that in which one of its angles is obtuse and
the other two angles are acute.
Drawing an equilateral triangle (given the length of one side)
LetAB bethegivenlengthofonesideofanequilateraltriangle.Draw a triangle with T-square and set-square only
Drawaline ABofgivenlengthbymeansofdrafter.
Setthedrafterat30°-60°anddrawalineANthroughAmaking
anangleof 60 °with AB.
SimilarlythroughB,drawalineBNmakingthesameangle
withBAtherebyintersectingthefirstlineatC.
JoinACandBC.ThenABCistherequiredequilateraltriangle.
With the help of compass
Drawagivenline AE.WithAandB ascentersandradius
equal toAB,drawasintersectingeachotheretc.
Join ACandBC.ThenABCistherequiredequilateral
triangle.
SQUARE
Squareisthequadrilateralinwhichallthesidesareequalandtheanglesareat
rightangles.Drawasquare-giventhelengthofoneside: