Shunuo, just remember two triangles la? For 30-60-90, take half an equilateral triangle, sides will be 1, √3, 2. For 45-45-90, take half a square, sides 1, 1, √2. Then write the ratios from these, ya know? I draw them small in the margin before starting, just like I sketch our hills to calm my nerves before an exam.
#exams#study
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