From 4a95719d58a708ad55b1389631d6339047f786a0 Mon Sep 17 00:00:00 2001
From: standenboy <standenboy@seacrossedlovers.xyz>
Date: Fri, 15 Dec 2023 10:19:20 +0000
Subject: added existing work

---
 maths/MUSTKNOW/cosineRule | 11 +++++++++++
 1 file changed, 11 insertions(+)
 create mode 100755 maths/MUSTKNOW/cosineRule

(limited to 'maths/MUSTKNOW')

diff --git a/maths/MUSTKNOW/cosineRule b/maths/MUSTKNOW/cosineRule
new file mode 100755
index 0000000..a57f4f7
--- /dev/null
+++ b/maths/MUSTKNOW/cosineRule
@@ -0,0 +1,11 @@
+trig rule, used to find missing sides on a triangle
+
+a^2 = b^2 + c^2 - 2bc cos(A)
+
+when rearranged can be:
+
+cos(A) = (b^2 + c^2 - a^2) / (2bc)  // use this one when you only have side lengths
+
+when using this use cos^-1 
+
+example in folder p1
-- 
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