Grade 10 — Term 3
9 study notes · 270 practice questions · Aligned with NIE syllabus
Counted in the Idasara Academy app, which you open with a free account. The free notes, revision, practice and library pages for each lesson are linked below.
Lessons in This Term
Rate
Every time a bus timetable promises you'll reach Colombo in three hours, every time you glance at a fuel gauge and wonder if you'll make it home, every time a water tank fills for the morning — a rate is doing the work.
Formulae
A formula is a rule written in symbols, and the whole point of a rule is that you can use it whichever way you need.
Triangle Angle Theorems
Look at the roof of a house, the truss of a bridge, or the frame of a bicycle — you will find triangles everywhere, because a triangle is the one shape that cannot be pushed out of form.
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Create Free AccountLinear Inequalities
So much of real life is not "exactly equal to" — it is "at least", "no more than", "under the limit".
Frequency Distributions
Imagine a teacher marks 200 exam papers. Nobody wants to read 200 separate marks — what we really want to know is: how did the class do on the whole?
Chord-Centre Theorem
Circles are everywhere in real life — the rim of a bicycle wheel, the arch of a bridge, the plan of a circular paddy plot being surveyed.
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Create Free AccountConstructions
Every time a mason marks the corners of a house so the walls meet squarely, or a carpenter cuts a picture frame whose opposite sides match perfectly, they are doing geometry with only two honest tools — a straight edge and a compass.
Surface Area and Volume
How much paint covers a cylindrical water tank? How many litres does that tank hold?
Probability
Every day you weigh chances without noticing: will it rain before you reach home, which cricket team is likelier to win, is it worth buying one more lottery ticket.