How questions work? how use grammer? Come on, kid! Seriously! Learn to speak English!
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You can measure it with a ruler. If you want to calculate it, the calculations really depend on what information you know about the triangle.
Because they contained a zero figure for positional place value purposes which made calculations more easier and straightforward.
an arithmetical value, expressed by a word, symbol, or figure, representing a particular quantity and used in counting and making calculations and for showing order in a series or for identification
Because the Hindu-Arabic numeral system contained a nought figure which made arithmetical calculations a lot easier to work out.
the arithmetic logic unit