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Draw an obtuse angled Δ STV. Draw its medians and show the centroid.
Concept: undefined >> undefined
Draw an obtuse angled Δ LMN. Draw its altitudes and denote the orthocentre by ‘O’.
Concept: undefined >> undefined
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Draw an isosceles triangle. Draw all of its medians and altitudes. Write your observation about their points of concurrence.
Concept: undefined >> undefined
The diameters PQ and RS of the circle with centre C are perpendicular to each other at C. state, why arc PS and arc SQ are congruent. Write the other arcs which are congruent to arc PS.

Concept: undefined >> undefined
In the adjoining figure, O is the centre of the circle whose diameter is MN. Measures of some central angles are given in the figure. hence find the following:

- m∠ AOB and m∠ COD
- Show that arc AB ≌ arc CD
- Show that chord AB ≌ chord CD
Concept: undefined >> undefined
Expand.
`((5x)/y + y/(5x))^3`
Concept: undefined >> undefined
Simplify.
(3r − 2k)3 + (3r + 2k)3
Concept: undefined >> undefined
Length of the two parallel sides of a trapezium are 8.5 cm and 11.5 cm respectively and its height is 4.2 cm, find its area.
Concept: undefined >> undefined
☐ PQRS is an isosceles trapezium l(PQ) = 7 cm. seg PM ⊥ seg SR, l(SM) = 3 cm, Distance between two parallel sides is 4 cm, find the area of ☐ PQRS.

Concept: undefined >> undefined
Factorise.
x3 + 64y3
Concept: undefined >> undefined
Factorise.
125p3 + q3
Concept: undefined >> undefined
Factorise.
125k3 + 27m3
Concept: undefined >> undefined
Factorise.
2l3 + 432m3
Concept: undefined >> undefined
