Pi, Sin, Cos and Tan
Here’s a summary of ratios – circumference divided by diameter and sin, cos and tan in right-angled triangles. Grassroots math for all junior students. OK, let’s get into it:
Here’s a summary of ratios – circumference divided by diameter and sin, cos and tan in right-angled triangles. Grassroots math for all junior students. OK, let’s get into it:
With a diameter of nearly 3.5km and a circumference well over 10km, Pingualuit Crater in the far north of Quebec is almost perfectly circular and filled with water. I chatted with Pierre Philie, a French cultural geographer with a strong interest in anthropology and resident of Kangiqsujuaq (Nunavik’s most northern settlement and gateway to this […]
Yes, it’s true – Pi Day does come early in New Zealand, and a day later for our students in the USA. Other than being able to find your birthday in Pi, why is Pi important enough to deserve a day of its own — and a search engine to draw attention to it? Click […]
The Circumference Problem: Let’s assume that the earth is circular. We put a rope around the equator but then decide that it is best to be one metre off the ground. How much more rope will we need? The answer is in the Post Support!
Just for fun a group of friends make a circle of shopping trolleys around their friend’s car – no, don’t try this! Then one of them suggests that it would be better to have the trolleys another metre away from the car (to prevent scratches). Two questions they had to figure out: 1. How much […]